The Samsung SGH-i780 is the latest Windows Mobile device to receive the Windows Mobile 6.1 upgrade treatment.
The process will require that you first install the Samsung modem driver. The SGH-i780 Firmware Updater will then guide you through the rest of the process.
Note: The update will replace the current ROM image and will erase partnership and all user data and programs on your device. Be sure to back everything up before you start.